Abstract
Serum thyroglobulin levels were serially measured in 25 normal pregnant women to evaluate thyroidal activity during normal pregnancy. Measurements included serum T3, T4, free T4, TBG, and TSH. Tg and FT4 levels were found to be decreased in the third trimester when compared with those of the first trimester and with those of normal non-pregnant individuals (P less than 0.01). TSH levels were higher than normal in pregnant women at all stages of pregnancy, with a significant rise at the third trimester. These findings suggest the presence of a subclinical hypothyroid state in the late stage of normal pregnancy.
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